Re: [Xenomai-help] CPU load over 90%

[Jan Kiszka <jan.kiszka@domain.hid>]

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Lauener Nathan wrote:
> Hi, 
> I am using Xenomai to read data from different sensors in real time from
> user space. So far I am reading position data from a device attached to
> a serial port. The CPU load is at about 1%. I also have a
> microcontroller attached via USB to read encoder data. The USB device is
> a USB-to-serial converter. As soon as I open the (USB-)serial port with
> normal systemcalls and read the incoming data my CPU load skyrockets to
> over 90%. I only read about 30 bytes every 100ms.
> I ran the application on a much newer computer also to rule out any
> buggy hardware. The results stayed the same. Intensively searching the
> mailing list and provided documentation have not helped solve the
> problem. 
> I'm using Xenomai 2.1.0 with kernel 2.6.15.6. Xenomai is compiled into
> the kernel. I also use the driver xeno_16550A loaded as module. The
> USB-to-serial bridge used is a CP2101 from Silabs. 

Is there any IRQ conflict between the USB host controller and some
RT-device? Please check /proc/interrupts and /proc/xenomai/irq.

Which process is consuming your CPU time? At system or at user level?

Jan


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